Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> b49a272b5e1a60ec96981f01180c132f229cc024f135f88ec1ac2346604f6f48:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

error: pre-condition failed: listing has already been purchased
   --> 4eb8a10cb9f87357.NFTStorefront:243:16